Revealing mistake: When you see Freddy's car parked outside the Myers' house when the trunk is open,you can easily tell that the background is artificially created and there is a wall at the side with painted clouds.

Revealing mistake: When Dr Mixter is talking about Carl Jung in the classroom the camera pans over the students and if you look at the blonde girl with the pink sweater on she stares at the camera for about a second.

Revealing mistake: Freddy's car is parked outside Michael Myers' house twice. First, when the trunk is open with the adapted machine and then he parks on the other side of the road after Charlie gets killed.

After Michael kills Laurie at the beginning, he hands the knife to the inmate with the clown mask. The next kill is the cameraman for which he uses the tripod ends. A few scenes later they show Michael standing holding a knife with fresh blood on it. He hasn't killed anybody with this knife yet so where did the blood come from?